The unit was downgraded from 2,500hp to the standard GP38 2,000hp. A paper air filter box was added behind the central air intake ahead, and the dynamic brakes were removed as evidenced by the blanking out of the blister (which was also cut short to accommodate the paper air filter). The original GP35 class lights were replaced with the FRA-approved 'bug-eyes' typically found on newer EMD locomotives. The GP35 turbocharger was removed and two more exhaust stacks were added. The experiment was determined to be not economically viable and the unit became the only such rebuilt locomotive on the system. CR GP38 7635 was finally retired on June 11, 1997.